AI Alt Text Generator — Free
Upload any image and get accurate, SEO-ready alt text in seconds. Accessibility-compliant descriptions for web images, e-commerce, and blog photography.
1 · Image
2 · Goal
3 · Notes (optional)
0/500
Generated prompt appears here
Upload an image and hit generate
Tips for Alt Text Generator prompts
- Good alt text describes what is in the image factually — subject, action, context — not your interpretation of what it means.
- Include relevant keywords naturally when they describe the actual image content. Keyword-stuffed alt text that doesn't describe the image hurts SEO.
- For e-commerce product images: describe the product name, color, material, and key visual features visible in the image.
- Decorative images (dividers, background patterns) should use empty alt text (alt='') in HTML — the tool can identify these.
- Keep alt text under 125 characters for screen reader compatibility — longer descriptions use a 'longdesc' or aria-describedby attribute instead.
- For charts and graphs, alt text should describe the key data point or trend, not just 'a bar chart'.
Example prompts
A close-up of a matte black ceramic coffee mug on a white marble surface with a single soft shadow, highlighting the clean minimal design.
A woman in a red dress walking through a sunlit Paris street, with the Eiffel Tower visible in the soft-focus background.
Bar chart showing website traffic growth from January to June 2024, with a 47% increase highlighted in the June bar.
A golden retriever puppy sitting on green grass, looking directly at the camera with its tongue out on a sunny day.
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Free AI alt text generator — how it works
Upload any image — product photo, blog illustration, social media graphic — and the tool analyzes its content and generates accurate, descriptive alt text optimized for both SEO and accessibility compliance. The output describes the image's subject, context, and key visual elements in plain, natural language that search engines and screen readers both process correctly.
Web developers, SEO specialists, e-commerce teams, and content editors use AI alt text generation to handle image descriptions at scale. Writing alt text manually for thousands of product images or blog photos is time-consuming; AI generation produces consistent, high-quality descriptions in seconds per image.
SEO and accessibility benefits of proper alt text
Alt text serves two critical functions: it describes images to visually impaired users relying on screen readers (WCAG accessibility compliance), and it provides Google's image crawler with textual context about the image's subject (Google Images SEO and general page relevance). Missing or poor alt text is one of the most common on-page SEO and accessibility failures across commercial websites.
For e-commerce, descriptive alt text on product images directly contributes to Google Shopping visibility and organic image search traffic. 'Matte black ceramic coffee mug, 12oz, minimal design' as alt text on a product image signals product-relevant keywords to Google while accurately describing the image for accessibility compliance. PromptMake generates alt text that satisfies both goals simultaneously.
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Related guides
FAQ
What is alt text and why does it matter?
Alt text (alternative text) is an HTML attribute that describes an image in text form. It serves two purposes: screen readers read alt text aloud for visually impaired users (accessibility), and search engines use it to understand image content (SEO). Missing alt text violates WCAG accessibility guidelines and leaves image search ranking potential uncaptured.
How long should alt text be?
Keep alt text under 125 characters for optimal screen reader compatibility. This is enough for a clear, descriptive sentence. If an image requires a longer description (complex charts, detailed illustrations), use a visible caption or the aria-describedby attribute for the extended description, and keep alt text as a brief summary.
Should alt text include keywords?
Include keywords naturally if they accurately describe what's in the image. An image of a running shoe on white background: 'Nike Air Max 2024 running shoe in black and white, side profile' is both accurate and keyword-rich. Keyword-stuffed alt text that doesn't describe the actual image ('buy cheap running shoes online fast delivery') is flagged as spam by Google and is useless for accessibility.
What alt text should decorative images have?
Decorative images (dividers, background patterns, purely aesthetic elements) should use empty alt text: alt=''. This tells screen readers to skip the image without announcing it. Using descriptive alt text on decorative images creates noise for screen reader users who don't need that information.
Is it free?
Yes — 3 free image-to-prompt generations per day without signing up.